Loctite SF 7649 Primer & Accelerator Spray & Brush-on Bottles for Threadlockers (variety of sizes)

Product Name

Loctite SF 7649 Primer & Accelerator Spray & Brush-on Bottles for Threadlockers

Brief Description

Loctite SF 7649 is a solvent-based primer and accelerator (activator) specifically formulated to increase the cure speed of Loctite anaerobic adhesives and sealants, including threadlockers. It is particularly effective on passive metal surfaces, in applications with large bond gaps, and in low-temperature environments (below 15°C or 60°F), ensuring robust bond strength without compromise.

Popular Applications & Uses

- Accelerating the cure speed of Loctite anaerobic threadlockers, retaining compounds, gasketing, pipe sealing, and thread sealing products.- Facilitating bonding on passive metals such as stainless steel, plated parts, galvanized steel, and anodized aluminum.- Enhancing cure performance in applications with large bond gaps.- Ensuring reliable curing in low-temperature conditions (below 15°C / 60°F).- Used in industrial assembly and maintenance where fast curing times are essential.

Industries that Commonly Use It

- Aerospace/Defense- Automotive Service/Repair- Construction/ Building Services- Energy- General Manufacturing- Government & Military- Industrial Supply- Medical Device/ Prosthetics- Metal Fabrication- Transportation/ Specialty Vehicle

Special and Unique Features

- Promotes rapid cure speed of Loctite anaerobic adhesives and sealants.- Specifically designed for use on passive and inactive metal surfaces.- Enables effective curing in low-temperature conditions (<15°C / <60°F).- Ideal for applications involving large bond gaps.- Preserves the ultimate strength and durability of bonded joints.- Offers a long on-part life of up to 30 days after application, allowing for flexible assembly times.- Available in convenient spray-on aerosol cans and brush-on bottles.- Certified to ANSI/NSF Standard 61 for use in commercial and residential potable water systems.- Registered to NSF Category P1 for use in and around food processing areas where there is no possibility of food contact.- Complies with MIL-S-22473E for existing designs and ASTM D-5363 for new designs.

Key Properties

- Chemical Type: Copper salt and Aliphatic amine.- Solvent: Acetone.- Appearance: Transparent, green liquid.- Viscosity: Very low, approximately 2 mPa·s (cP).- Specific Gravity: 0.79 at 25°C.- Flash Point: -18°C (-4°F), classified as highly flammable.- Drying Time: 30 to 70 seconds at 20°C.- On-Part Life: Up to 30 days.- Cure Type: Non-curing (activator).

Surface Compatibility

- Recommended for use with passive metals such as stainless steel, plated parts, galvanized steel, and anodized aluminum.- Compatible with inert surfaces.- Generally suitable for various metal surfaces.- The solvent carrier can affect certain plastics or coatings; it is recommended to check all surfaces for compatibility before use.- Loctite recommends 7649 for use with some plastics like nylon in specific applications.

Known backups / known substitutes

- Loctite SF 7471 Primer T (another solvent-based primer for anaerobic adhesives, with some differences in application focus).- Hernon Primer 50 (a single component, non-CFC solvent-based product).- Hernon EF Primer 49 (a single component, non-CFC solvent-based product).- Bondloc B7649 (marketed as an equivalent to Loctite SF7649).- Loctite Klean and Prime (identified as an automotive equivalent of 7649).

Comparison Note

Loctite SF 7649 is particularly distinguished by its strong performance in accelerating the cure of anaerobic adhesives on large bond gaps (typically >0.5 mm) and in low-temperature conditions (below 15°C). While Loctite SF 7471 also serves as an anaerobic primer, 7649 generally achieves faster initial bond strength. Both primers are effective on passive metals, but the choice often depends on specific application requirements regarding gap size and ambient temperature.